After some searching online yesterday I found out that ThinkorSwim license an abridged version of their platform to the CBOE for papertrading, and it's free to use after registering your email address;
The data is delayed but at least this means I can still use their chart tools for end of day analysis. It also comes with ProphetCharts and I've already saved some of my indicators into it, I won't be able to use them to trade intra-day though, due to the delay.
It's quite a relief to have found this. It's not possible to save the chart settings on the main chart function so I'll just have to keep it open all the time so I'd don't have to change the darn settings every time I want to use it.
This is from the CBOE's web based "Paper Money" platform:
Why couldn't the guys at ThinkorSwim tell me about this?
I asked them the specific question -
"Is there any way I can access a demo account from the UK?"
"No sir, there is not."